CVE-2026-75099 in Allura
Summary
by MITRE • 08/24/2026
Unauthenticated REST disclosure of certain content items in Apache Allura.
This issue affects Apache Allura: through 1.19.1.
Users are recommended to upgrade to version 1.20.0, which fixes the issue.
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Analysis
by VulDB Data Team • 08/24/2026
The vulnerability identified as an unauthenticated REST disclosure of certain content items in Apache Allura represents a significant information leakage flaw within the platform's application programming interface layer. Apache Allura is an open-source code hosting and collaboration tool that supports multiple version control systems, bug trackers, wikis, forums, and other collaborative features for software development teams. The core issue stems from insufficient access controls on specific REST endpoints exposed by the application. These endpoints are designed to retrieve content items such as wiki pages, forum posts, or ticket details, but they fail to properly enforce authentication requirements before serving data to requesting clients. This misconfiguration allows any remote actor with network connectivity to the service to query these interfaces without providing valid credentials, thereby bypassing standard security mechanisms intended to restrict access to sensitive organizational information.
From a technical perspective, this flaw is classified under CWE-200 as an Information Exposure vulnerability, specifically falling into categories related to unauthenticated access to sensitive data. The REST API endpoints in question likely lack proper middleware checks or session validation routines that verify the identity and permissions of the user making the request. In many web applications, especially those built on frameworks like Pylons which underpin Apache Allura, developers may inadvertently expose internal methods as public APIs without applying appropriate decorators for authentication. This oversight results in a situation where data intended for authenticated users is accessible to anonymous visitors. The vulnerability affects versions of Apache Allura through 1.19.1, indicating that the security patch was not included in releases prior to version 1.20.0. Attackers can exploit this by crafting simple HTTP GET requests to specific API paths known or discovered through enumeration tools, retrieving structured data such as JSON responses containing project details, user lists, or content metadata without any form of login interaction.
The operational impact of this vulnerability is primarily centered around the compromise of confidentiality and potentially integrity if combined with other flaws. By accessing unauthenticated REST endpoints, an attacker can gather substantial intelligence about the target organization's software development activities. This may include identifying active projects, understanding the structure of repositories, discovering internal documentation or wiki pages that were not meant for public consumption, and mapping out user roles based on visible content ownership. Such information gathering is a critical phase in reconnaissance attacks as defined by the MITRE ATT&CK framework under techniques like T1592 Gather Victim Host Information or T1087 Account Discovery. The exposed data can facilitate further targeted attacks, such as social engineering campaigns against specific developers identified through their project involvement, or it may reveal internal IP addresses and domain structures that aid in more direct network-based exploitation attempts. While the immediate impact is informational disclosure, this exposure significantly lowers the barrier for subsequent malicious activities by providing attackers with a detailed map of the application's logic and data hierarchy.
Mitigation strategies focus on both immediate remediation and long-term security hardening. The primary recommendation provided by Apache Software Foundation is to upgrade immediately to version 1.20.0 or later, where this specific access control flaw has been addressed in the codebase. For organizations unable to patch instantly due to operational constraints, temporary mitigations should include implementing a web application firewall rule set that restricts direct access to known vulnerable REST endpoints from untrusted networks. Additionally, administrators should review API documentation and test all exposed endpoints for authentication requirements using automated scanning tools or manual penetration testing techniques. It is also advisable to implement strict rate limiting on these endpoints to prevent excessive enumeration attempts by malicious actors. Long-term improvements involve adopting a security-by-design approach where all REST APIs are explicitly defined with required authentication scopes, ensuring that no endpoint defaults to public access unless intentionally configured otherwise. Regular audits of API permissions and integration of static application security testing in the development pipeline can help detect similar misconfigurations before they reach production environments.